Philips CT6558 Quick start guide
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PHILIPS Date :2004-9-7
Tuning Up procedure & Operational Manual Page No. : Page 1 of 1
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CONTENT
1.0 Objective
This document outlines the trouble shooting for the CT6558.
2.0 Scope
1. Used for radio trouble shooting in factory.
2. Used for radio trouble shooting in customer service.
3.0 Definition of terms
Nil
4.0 Responsibility
Nil
5.0 Detail procedure
5.1 General description………………………………………………………………….
5.11 Product Overview…………………………………………………………….
5.12 Product technical parameters ………………………………………………
5.2 CT6558 Signal Flow Overview………………………………………………..
5.21 Receiver Principle and troubleshooting……………………………………..
5.22 Transmitter Principle and troubleshooting…………………………………..
5.23 Logic circuit Principle and troubleshooting…………………………………
5.3 Exploded view and figures…………………………………………………………...
6.0 Referrence
6.1 CPU (OM6357-7)…………………………………………………………………..
6.2 PMU (PCF50603)…………………………………………………………………..
6.3 Tranceiver (UAA3537HN)………………………………………………………….
6.4 PA&PAC IC (SKY77324)…………………………………………………………..
6.5 CAMERA IC (BU1594GS)…………………………………………………………
6.6 MEMORY (M36L0R7050T0ZAQT/STM)………………………………………...
6.7 MELODY IC (ML2864)…………………………………………………………….
6.8 CHARGE IC (UBA2008)……………………………………………………………
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5.1 General description
5.11 Product overview:
CT6558 product is new model phone designed by CECW, it works at Tri-band, EGSM、DCS and PCS band
its weight is only 85g, the size is 85x45x24 CT6558 is a more powerful product, with 300,000 pixels camera
sensor inside, 65k colors CSTN main display which pixels is 128*160,sub-display is STN screen, and has 64
polyphonies, and has hand free function.
CT6558 CPU runs at 13MHz, with 128M Flash Memory and 32M SRAM. The main IC include CPU
（OM6357EL/3C5/7）、FLASH(M36L0R7050T0ZAQT /STM)、PMU(PCF50603)、Transceiver(UAA3537HN)、
PA(SKY77324), CT6558 can dial 4 hours continuously and can be in idle mode up to 400hours ,using 600Mah
LI battery.
5.1.2 Product technical parameters:
GENERAL:
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item EGSM(GSM) DCS PCS
Frequency
allocation
TX（Uplink）
:880MHZ-915MHZ
RX（Downlink）
:925MHZ-960MHZ
TX（Uplink）
:1710MHZ-1785MHZ
RX（Downlink）：
1805MHZ-1880MHZ
TX（Uplink）：
1850MHZ-1910MHZ
RX（Downlink）：
1930MHZ-1990MHZ
Channel
band width 200KHz 200KHz 200KHz
Channel 975-1023,0-124 512-885 512-810
Modulation GMSK,BT=0.3 GMSK,BT=0.3 GMSK,BT=0.3
TX/RX
channel
space 45MHz 95MHz 80MHz
(Fn)Freq.
calculating
formula
GSM
Fn=890.2+(N-1)*0.2
EGSM
Fn=880.2+(N-975)*0.2
N: Channel No. Unit: MHz
Fn=1710.2+(N-512)*0.2
Unit: MHz
Fn=1850.2+(N-512)*0.2
Unit: MHz
5.2 CT6558 Signal Flow Overview:
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RF Connector
RF Switch
PA&PAC
Bat. Conn.
IO Conn.
PMU
Charger IC
SIM Conn.
Memory
IRDA
CPU
MIDI IC
26M oscillator
Backup Battery
Tranceiver
SAW Filter
LCD conn.
32K oscillator
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5.2.1 Receiver principle and troubleshooting
CT6558 RX signal flow chart(Figure 1)：
Antenna 7010 7130
Hall IC
Blue backlight
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EGSM SAW Filter
RF CONN RF_SW PCS SAW Filter Tranceiver
DCS SAW Filter
I&Q
Receiver CPU
7300
Figure 1
1.CT6558 downlink signal flow fromAntenna to RF-Connector：
The aerial signal mobile phone received go from antenna to RF Connector。RF Connector, which is a
special parts developed for RF test. By connecting U501 and RF cable to spectrum analyzer, you can
measure the signal.
2. Signal output from RF Connector will be input to RF_SW。Tranceiver control FSW1、FSW2、FSW3
signals, which will be in charge of RF_SW in relative Band(EGSM、
DCS、
PCS)，
and in TX/RX status.。
From Antenna
RF-Connector
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Following is the relative controlling signal status :
3. The RX signal output from RF_SW, flowing to relative SAW Filter, then go through Balun circuit ,
input to tranceiver.
SAW Filter
RF Switch
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For example:(EGAM, 925-960Mhz)
SAWFilter(EGSM)
4. 7130 is the main IC in RF circuit, which response for signal modulation and demodulation. Signal
input in 7130 after pass BPF, Signal pass LNA, then mix with local signal (RF-VCO) get the -100Khz
signal. After pass the filter, output (IA IB QA QB) IQ signal. RF-VCO is fully integrated inside 7130.
EGSM
PCS
DCS
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The receiver consists of two distinct parts, the RF receiver front-end and IF section. The RF
front-end amplifies the EGSM/DCS/PCS aerial signal, converts the chosen channel down to a low IF of
–100kHz,and provides in addition more than 35dB image suppression. Fout LNAs are available on chip
and can be configured to allow 3 bands(low, high and switched).The switched LNA will be used for
roaming in different countries. some selectivity is provided at this stage by an on-chip low-pass filter,chan
channel selectivity is provided by means of a high performance integrated band-pass filter. The IF section
further amplifies the wanted channel, performs gain control to tune the output level to the desired value
and rejects DC.
5.Four IQ signals input to CPU , go through A/D ,DSP, and D/A section in CPU , then output to receiver.
LNA IQ Down mixer Channel Filter
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